diff --git a/docker-stacks/app-server/penpot.yml b/docker-stacks/app-server/penpot.yml
index 5eadb6a..5ef7b3f 100644
--- a/docker-stacks/app-server/penpot.yml
+++ b/docker-stacks/app-server/penpot.yml
@@ -36,10 +36,7 @@ services:
     networks:
       - penpot-net
     environment:
-      # Explicit individual mapping expansions clear the parsing pipeline
-      << : *penpot-flags
-      << : *penpot-http-body-size
-      << : *penpot-public-uri
+      <<: [*penpot-flags, *penpot-http-body-size, *penpot-public-uri]
 
   penpot-backend:
     image: "penpotapp/backend:${PENPOT_VERSION:-latest}"